Henry b



H. B. ADAMS. BLOWER.

No. 26,962. Patented Jan 31, 1860.

UNITED STATES PATENT OFFICE.

HENRY B. ADAMS, OF NEW YORK, N. Y.

FAN-BLOWER.

Specification of Letters Patent No. 26,962, dated January 31, 1860.

To all whom it may concern:

Be it known that I, HENRY B. ADAMS, of the city, county, and State of New York, have invented a new, useful, and Improved F an-Blower, all of which is fully and clearly set forth in the following specification and accompanying drawings, including the letters of reference marked thereon and making part of the same.

Like letters refer to like parts in each drawing.

Figure 1, is a side View of the exterior. Fig. 2, is a side view of the interior.

a a Figs. 1 and 2, represent two parallel shafts, upon which is shown the two geardriving wheels (Z (Z and the two fan wheels 6 b, with four blades 0 c on each fan wheel. The four blades on each fan wheel, have plane surfaces, and are made very thin, so as to give greater space for volume in proportion to the diameter of the fan-wheels.

The blades 0 c are connected together by the segment of a circle, forming a concave surface between the two blades, so as to allow each blade of the two fan wheels to occupyin succession this concave surface during a quarter revolution of the fans in such a manner as to close the space between the two shafts a a.

f is the inlet, and g, is the outlet orifices.

c, Fig. 2, represents the casing, the interior surface of which is seen to gradually recede or diverge from the centers of rotation of the fan wheels 6 Z). This gradual recession of the interior surfaces of the casing c from the centers of rotation, is of great utility in double fan wheel blowers, owing to the great compressible and expansible qualities of the atmos oheres, which enable the fan wheels to crowd in, and impart a much greater volume of air, consequently producing a more steady and powerful blast. Experiment has shown that this form of case, or causing the initial point of this gradual divergence to commence at, or near a point on the inner periphery parallel to the aXis of the case to be the most effective, see H, Fig. 2 of drawings.

In all rotary blowers having double, or two fan wheels combined, and both the openings for delivery and reception of fluids at their peripheries, in order to secure a large and powerful blast.

It is essential to construct the propelling wheels so as to close the intervening space between the two wheels, in such a manner as to retain the largest space for volume together with the largest, most direct and powerful propelling surface in a given area, all of which ars the most successfully obtained by the combination of two fan wheels as herein described.

Then only two blades, are used on two combined 'fan wheels, for propulsion, and to close the intermediate space between the two wheels, it is a mechanical necessity that each of the two blades upon the two fan wheels, be made at least half the thickness of its entire length, with strongly marked c011- cave and convex surfaces, thereby consuming much more valuable space and presenting much less and much inferior propelling surface than four flat and thin blades.

When more than two blades on each wheel are used having concave, or concave and con- Vex surfaces combined, the same difiiculties arise in the consumption of valuable space and inferior propelling surfaces.

The fan wheels I) b may be driven in either direction by a pulley and belt upon either end of either shaft a a.

Having thus fully described my invention, I disclaim all fan wheels working in pairs, when constructed with concave, or concave and convex surfaces combined; also, all fan wheels with plane surfaces when working single.

lVhat I claim is- The casing e of the described configuration when in combination with double working plane surface blades 0 c as described.

HENRY B. ADAMS.

Witnesses:

G120. W. Wrens, ABM. BARSHOLF. 

